Device for automatically reversing the travel of type-writer ribbons.



. 0. RUTISHA-USER.

DEVICE FOR AUTOMATIGALLY REVERSING THE TRAVEL OF TYPE WRITER BIBBONS.

1 APPLICATION FILED AUG. 21, 1908. 936,257.

' Patented Oct. 5, 1909. .9 f I g,

,ywf/ W MWWJ versmg the travel of the 936,20 1 p ifi of Letters PatentPatented Get. 5, 1909. Application filed August 21, 1908. Serial No.449,694. To ollgohom it may concern: 1 the arms, stands level with thereel. There Be it known that 1, Oscar RUTISHAUSER, a subject of theSwiss Republic, and resident of St. Gallen, Switzerland, have inventedan Improved Device for Automatically Reversing the Travel ofType-\Vriter Ribbons, of which the following is a specification.

' The subject of the present invention is a device for automaticallyreversing the travel oftypewriterribbons. In this device when the ribbonis completely unwound from one of the reels, the tension of one arm of aright angled lever and moves it, whereby a slide connected to the otherarm of the lever is made to change its po- The aim of H115 device is toeffect drive sition. the transposition of the pawls which the reels. A dautomatically reribbon has been made known by the German specificationNo. 184,042, lass 15. The device for moving the slide in the latterarrangement does not cause the reversing of the reel drive directlythrough the slide, as the latter is only used as a connecting linkbetween two devices which are coupled together, one being moved by theribbon and by the force of the spring driving the slider, while theother causes the alternate engagement and 'sengagement of the wheelsdriving the ribls under the influence of the spacing device. Theaccompanying drawing shows a form of the present invention, Figure 1being a front View of the gear for automatically reversing the ribbon,and Fig. 2 a plan of he same. Spindles d are fitted on both sides of thetypewriter frame a, and are guided in the eyes 6, b and 0,4 Plates 0 arecarried at the 'uppe'rends of't-hese spindles. whose cylindrical bossesf are provided with five or more grooves g. The reels 72 are accuratelyfitted on the bosses f and keys 2' are driven into the grooves f/ sothat any turning of the spindles causes the reels to revolve also. Atthe lower end of the spindle (Z, the small toothed Wheel 75 is fittedand fixed to it by a pin Z driven' through boss and spindle.

Between the eyes 71 and c and 72 w respectively, are short lengths of pipe m andv m respectively.

These pieces are revolullly mounted on the spindle r] and haverespectively arms a and 12 and n and o attached to them. The first twoare so situated that a loose sleeve 1, seated upon the stops upon theribbon acts upon is also another loose sleeve on each side fitted on apin on arms 2) which are fixed to the machine frame. Pins 9 and grespectively fitted on the same arm serve to prevent the ribbon, whichpasses between them andthe sleeve 1 from falling down. The lower arms 0ando are connected respectively by pins 8 to semicircular pieces t andtthe other end tongue pieces which are u to theplates o. The screwsu-serve also to fasten the plates 0 to the rod 20 which passes throughthe frame (Z, and lies in bearings in the frame so that it can beaccurately s of which end in connected by screws adjusting rings at. Therod to vided with two notches 3 into which a spring mounted at a snapsas soon as the rod moves to one side or the other. Shoes 2 are providedin the plates c, which serveas guides for the hook shaped ends of therods 4, .which rods are connected to the cranks These shoes place bysprings 5 and cause the hooked ends of the rods 4 to engage with thetoothed wheels according to the direction of rotation.

he above described apparatus works as followsz-The cranks 3 which arefixed on the shaft 6 are-actuated by the keys of the typewriter in theusual manner by means of suitable transmission elements. -tion actuatesthe rods 4 so that by the engagement and disengagement of one or theother hook, the respective toothed wheel revolves and the ribbon iswound up or unwound. The automatic reversal of the motion of the latteris effected in this way. At the moment when the ribbon on one of the.reels is exhausted, the slight jerky movement of said ribbon caused bythe tension setup on the other the lever previously in contact therewithto be pushed away with its sleeve, and the other arm and sleevecomesinto contact with the ribbon. Simultaneously, the lower arms whichare firmly fastened to the pipe piece are respectively pushed away from,and into contactwith, the toothed wheel, and consequently the rod 4turns the toothed wheels and therefore the reels in the oppositedirection. The correct position-of the shaft a: with the guide plates vfor the rods 4 is insured by a spring 'which snaps into notches in theshaft: and

and 72 respectively,

adjusted in an axial direction by means of.

is also pro-- This mo-' Having; fully described my invention what 1"claim and desire Lo secure by 'i iette'isPM- eompu. in ei' donation,with reels for the ribbon, spindes d) on w iiLh said reels are mounted,tooihed wheels on said spindles rods ee) for actuating said toothedWheels, ziriiis revolubiy mounted on said spindles, a transverselyslidabie shaft (10), the rods for actuating said toothed'wheels beingfixed to -.2 travel if the ribbons,

eases":

sid shaft (w), so that they are disengaged 5 from one toothed Wheel andengaged with "be other when the shzii niw) is moved, means for securingsaid shaft {w} in position after movement, substantially as descri edand show I "in testimony whereof I. have hereunto set my hand in thepresence of two subscribing witnesses.

SEGA-$8 RUTiSHAUSEB.

i fi'tnesses U. GUBLER, (i; EHRLE.

